Yoshimura M, Marshall F J, Tinkle J S
School of Dentistry Hokkaido University, Sapporo, Japan.
J Endod. 1990 Jan;16(1):5-12.
Retrograde amalgam fillings were placed in 12 extracted human canines. The microleakage from the both directions (coronally and apically) was determined using pressurized fluid filtration at 90 min, 6 h, 1 day, 2 days, and 1,2,4, and 8 wk after amalgam filling. Leakage from either direction decreased markedly in the 90-min to 6-h interval after filling. At intervals between 1 day and 8 wk, only small changes in leakage were noted. After any time period, leakage from the coronal direction was greater than leakage from the apical direction. However, this difference was not statistically significant except at 90 min when the coronal leakage was significantly greater. This experimental system was shown to reliably measure microleakage in retrograde amalgam fillings.
在12颗拔除的人类犬齿中放置了逆行银汞合金充填物。在银汞合金充填后90分钟、6小时、1天、2天以及1、2、4和8周时，使用加压流体过滤法测定了从两个方向（冠方和根尖方）的微渗漏情况。充填后90分钟至6小时内，两个方向的渗漏均显著减少。在1天至8周的时间段内，仅观察到渗漏有微小变化。在任何时间段后，冠方的渗漏均大于根尖方的渗漏。然而，除了90分钟时冠方渗漏显著更大外，这种差异无统计学意义。该实验系统被证明能够可靠地测量逆行银汞合金充填物中的微渗漏。
